The only thing you can do is perhaps take him out for his cards.
I believe that deadbeats in team games dont get points if you win, thus if you win you get more points, but, it becomes harder for you to win.
The only "punishment" for his/her deatbeatage is that you are fighting a one person battle, might I suggest building up and staying the weak enough not to draw attention, but strong enough not for the other to come for your cards.
Let them beat eachother up a bit and then move in for one of their contients when the time is right
Good luck to you
Have a great day, may is be full of rear-end kicking come-backs
Twill